KR20020053271A - Device for preventing the temp- erature deflection in width direction of hot rolling strip - Google Patents

Abstract

PURPOSE: A device for preventing temperature deviation in a width direction of a hot rolled strip is provided minimize temperature deviation of the hot rolled strip in the width direction by reflecting a heat source generated from the central part of the hot rolled strip to edge parts of the hot rolled strip. CONSTITUTION: In an ordinary device for preventing temperature deviation in a width direction of a hot rolled strip in which left and right reflection plates(220,230) are covered parallel to each other in both directions around a cooling water groove(210) equipped on a transfer path of a hot rolled strip(S), the device comprises auxiliary reflection plates(10,10') which is mounted on both side parts of the outer wall of the cooling water groove(210) to change a reflection path of radiant heat radiated from the central part of the hot rolled strip(S); and driving units(20,20') which are mounted on both side parts of a transfer path of the hot rolled strip(S) to transfer the left and right reflection plates(220,230) along a width direction so that radiant heat reflected from the auxiliary reflection plates(10,10') during operation of the driving units(20,20') is collected to edge parts(E) through the left and right reflection plates(220,230) so as to prevent temperature deviation in a width direction of the hot rolled strip(S).

Description

Device for preventing the temperature deviation of hot rolled material {Device for preventing the temperature deflection in width direction of hot rolling strip}

The present invention relates to a hot rolled material that is pressed down to a desired thickness through rough rolling and finishing mill in the hot rolling process, and in particular, to resolve the width deviation in the width direction of the hot rolled material generated during entry into the finishing mill in the roughing mill. The present invention relates to a device for solving the temperature deviation in the width direction of a hot rolled material.

Generally, as shown in FIG. 1, the hot rolled material S reheated to a high temperature state by the slab or the heating furnace 100 cast in the continuous casting process has a thickness of 20 to 60 mm in the rough rolling process 110. It is pressed and reduced to a desired thickness and shape in the finishing rolling process 120, and then wound through the cooling process 130 and the winding process 140 to minimize the volume.

However, the hot rolled material S transferred to the finishing rolling process 120 via the rough rolling process 110 in the hot rolling process, for example, the hot rolled material S has a heat dissipation area in the width direction compared to the longitudinal direction. Because of this size, the temperature deviation is severely generated along the width direction, causing product defects such as cracks in the finishing rolling process 120.

On the other hand, as a means for solving the widthwise temperature deviation of the hot rolling material (S) passing through the finishing rolling process (120) via the rough rolling process (110), a separate heating means for the annual rolling material (S) Although a method of heating by using has been proposed, these devices have a disadvantage in that a separate additional cost for operating the heating device is increased.

In addition, as shown in Figure 2, the left and right reflectors (220, 230) side by side in both directions centering on the coolant grooves (210, 210 ', 210' ') provided on the upper side / both sides of the transport path of the hot rolling material (S) By installing the above, it has been proposed a method of keeping the radiation (R) emitted from the center of the hot rolling material (S) through the reflecting plates (220, 230).

Of course, the left and right reflection plates 220 and 230 are covered with the upper side of the hot rolling material S from the rough rolling step 110 to the finishing rolling step 12 0, in particular, of the left and right reflection plates 220 and 230. A heat insulating plate made of metal is attached to the inner circumferential surface to heat the radiation R reflected from the hot rolled material S.

However, the left and right reflector plates 220 and 230 as shown in FIG. 2 are simply covered and fixed on the upper side of the hot rolled material S, and are compensated for, for example, in the longitudinal direction of the hot rolled material 300. Although it is possible, the temperature deviation generated in the width direction is insufficient to solve, and there was a lack in maintaining a constant quality of the final product generated due to the width direction temperature deviation of the hot rolling material (S).

Accordingly, the present invention has been made to solve the problems described above, by reflecting the heat source generated from the center of the hot rolling material to the corner portion, so as to minimize the width difference in the width direction of the hot rolling material. It is an object of the present invention to provide a device for eliminating the width deviation of the hot rolled material.

In order to achieve the above object, the present invention is provided with an auxiliary reflector plate for changing the reflection path of the radiant heat emitted from the center of the hot rolling material on both sides of the outer wall of the cooling water groove, and the transfer path both sides of the hot rolling material. It is equipped with a driving device that transfers the left and right reflecting plates along the width direction, and the radiant heat reflected from the auxiliary reflecting plate during the operation of the driving device is condensed into the corners through the left and right reflecting plates, thereby eliminating the width difference in the width direction of the hot rolling material. It is characterized by.

1 is a schematic view showing a hot rolling process according to a conventional technique;

2 is a view showing a widthwise temperature deviation eliminating device according to the prior art,

3 is a view showing a widthwise temperature deviation solving apparatus according to the present invention,

4 is a view showing a cooling pattern of the hot rolled material according to the present invention,

5 is a view showing the temperature emitted from the reflector in the widthwise temperature deviation solver according to the present invention.

Explanation of symbols on the main parts of the drawings

100: heating furnace 110: rough rolling process

120: finishing rolling process 130: cooling process

140: winding process 210: cooling water groove

220,230: left and right reflector 10,10 ': auxiliary reflector

20,20 ': Drive device S: Hot rolled material

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a view showing a widthwise temperature deviation solving apparatus according to the present invention, Figure 4 is a view showing a cooling pattern of the hot rolling material according to the present invention, Figure 5 is a widthwise temperature deviation cancellation according to the present invention Figure showing the temperature emitted from the reflector in the apparatus, the left and right reflector plates 220, 230 are installed in both sides side by side with respect to the cooling water groove 210 provided above the conveying path of the hot rolling material (S) In the apparatus for eliminating the widthwise temperature deviation of the hot rolled material, the auxiliary reflection plate for changing the reflection path of the radiant heat (R) emitted from the center of the hot rolled material (S) on both sides of the outer wall of the cooling water groove 210 ( 10, 10 ') is mounted, and drive devices 20 and 20' are mounted on both sides of the transfer path of the hot rolled material S to transfer the left and right reflection plates 220 and 230 along the width direction. 20 ') during the operation of the auxiliary reflector (10,10') The radiant heat R reflected from the light is concentrated to the corner portion E through the left and right reflection plates 220 and 230, so that the width difference in the width direction of the hot rolling material S is eliminated.

First, since the coolant groove 210 and the left and right reflector plates 220 and 230 of the components according to the present invention are functionally the same as in the prior art, detailed descriptions thereof will be omitted here, but the auxiliary portions having the same shape on both sides of the coolant groove 210 will be omitted. It is noted that there is a difference in that the reflection plates 10 and 10 'are mounted and the driving devices 20 and 20' having the same shape are mounted on both upper and left sides of the left and right reflection plates 220 and 230, respectively.

Of course, among the left and right side reflecting plates 220 and 230, the left reflecting plate 220 is placed in a semicircular shape in the space between the cooling water groove 210 and the left cooling water groove 210 ', and the right reflecting plate 230 is a cooling water groove ( Of course, it is naturally seated in a semicircular space between the 210 and the right coolant groove 210 ''.

In addition, the auxiliary reflecting plates 10 and 10 ', the intensity of the radiation (R) in the process of reflecting the radiation (R) emitted from the center of the hot rolling material (S) to the edge portion (E) of the hot rolling material The shape and the inclination of the reflector are determined based on the direction perpendicular to the surface of the hot rolled material S so that is formed to be the largest.

That is, the left and right reflection plates 220 and 230 driven horizontally by the driving devices 20 and 20 'by utilizing the auxiliary auxiliary reflecting plates 10 and 10' which radiate the radiation R emitted from the center of the hot rolling material S. The shape is configured so that the radiation R is reflected at the outermost angle of the?

In addition, the left and right reflection plates 220 and 230 are preferably moved in the horizontal direction according to the operation of the driving devices 20 and 20 'so as to be adaptable to a change in the width of the hot rolled material S. It is preferable to reflect the radiation (R) at an angle close to horizontal to the edge portion (E) of the rolled material (S).

Therefore, in the state where the density of the central radiation line R of the hot rolled material reflected by the auxiliary reflector plates 10 and 10 'is reflected through the left and right reflector plates 220 and 230, the edge portion E of the hot rolled material S is reflected. The largest appear, it is possible to eliminate the temperature drop phenomenon appearing at the corner of the hot rolled material (300).

EXAMPLE

First, the key point in the present invention is the reflection efficiency of the radiation (R). That is, when the reflection efficiency due to the radiation (R) emitted from the central portion of the hot rolling material (S) is large, the optical application can be configured by calculation.

In addition, as a means for measuring the reflection efficiency of the radiation (R) of the hot rolled material (S), a number of comparative reflectors (size iron plate, insulation made of cerac wool, aluminum, the size of 50mmT × 80mmW × 150mmL) Foil, aluminum foil + insulation) to measure the cooling rate to compare the efficiency.

Figure 4 shows the cooling rate from 1050 ℃ in the hot rolled material, the cooling rate is about 26 ℃ / min when using the foil before forming the aluminum alloy as a reflecting plate, the cooling rate 49 ℃ / when using an iron plate Compared with min, the temperature tended to be much lower. Especially, when the insulation material was used for aluminum foil, the cooling rate was about 35 ℃ / min.

And, Figure 5 is a view showing the temperature emitted from the reflector in the widthwise temperature deviation eliminator, the case of using the aluminum foil as a reflecting plate shows a significantly lower temperature than when using a reflecting plate made of other materials, It shows low emission.

In addition, the aluminum foil showed a result that is not damaged even after being used as a reflector, it was shown that when the reflectance according to the present invention is stable, it is not necessary to attach a separate cooling facility.

As described above, according to the apparatus for solving the width deviation of the hot rolled material according to the present invention, the center radiant heat of the hot rolled material reflected from the auxiliary reflecting plate during the operation of the driving device is applied to the edge of the hot rolled material through the left and right reflecting plates. Condensed into parts, the temperature drop phenomenon occurring at the edges of the hot rolled material in the hot rolling process is eliminated, so that the unevenness and quality degradation caused by the width difference in the width direction of the hot rolled material are eliminated. Not only is the quality of the product improved, but the reduction of the production cost of the rolled product is reduced, thereby improving productivity.

Claims (1)

Apparatus for relieving the width deviation of a conventional hot rolled material having a structure in which the left and right reflectors 220 and 230 are covered side by side in both directions centering on the coolant groove 210 provided above the conveying path of the hot rolled material S. To Auxiliary reflector plates (10, 10 ') for changing the reflection path of the radiant heat (R) emitted from the center of the hot rolling material (S) on both outer walls of the cooling water groove 210 is mounted, the hot rolling material (S) Driving devices 20 and 20 'are provided to transfer the left and right reflecting plates 220 and 230 along the width direction to both sides of the conveying path of the auxiliary reflecting plates 10 and 10' during the operation of the driving devices 20 and 20 '. Radiation heat (R) reflected from the) is concentrated to the edge portion (E) through the left and right reflector plates (220, 230) widthwise temperature deviation of the hot rolled material, characterized in that the widthwise temperature deviation of the hot rolled material (S) is eliminated Relieving device.